If the oil pressure switch has only one terminal. it is either normally open, or normally closed. (usually normally closed.) The warning light is not grounded at the light, it will have two leads. (or the wrong light is in the hole). One lead goes to the ignition, the other goes to the pressure sw. wwhen the engine is on not running, the Switch is closed lighting the light. When it starts, the Oil pressure opens the switch and the light goes out. The alternator is a different animal, and we need to know what kind it is, and if it is a modified version of that. There are too many variables to try to guess. JimN
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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